<?php

class mtgMetaInterface extends mtgUserType
{
  protected $funcs = array();
  protected $implements = null;

  function __construct($name, array $implements = array(), $tokens = array())
  {
    parent::__construct($name);

    $this->implements = $implements;
    $this->tokens = $tokens;
  }

  function validate(mtgMetaInfo $meta) {}

  function getImplements()
  {
    if(!$this->implements)
      return array();

    $imps = array();
    foreach($this->implements as $imp)
      $imps[] = $imp->resolve();
    return $imps;
  }

  function getFuncs()
  {
    return $this->funcs;
  }

  function addFunc(mtgMetaFunc $fn)
  {
    if($this->hasFunc($fn->getName()))
      throw new Exception("Interface '{$this->name}' already has func '{$fn->getName()}'");

    $this->funcs[$fn->getName()] = $fn;
  }

  function hasFunc($name)
  {
    return isset($this->funcs[$name]);
  }

  function getFunc($name)
  {
    if(!isset($this->funcs[$name]))
      throw new Exception("No such funcs '$name'");
    return $this->funcs[$name];
  }
}